The week in pictures: 27 July 2012

A biker is engulfed in a ball of fire as his 1950cc twin-cylinder machine explodes. Greger Johansson was performing a 'burnout' to heat his tyre when the 190mph nitro superbike malfunctioned. Photographer Andy Willsheer managed to capture the moment the fireball erupted - and a piece of the engine came hurtling towards him at Tierp Arena, Sweden. Andy says: "There was a bang then he was engulfed in flames. The intake manifold came flying towards me spewing flames, but luckily it clattered to the ground."Picture: Andy Willsheer / Rex Features